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Segment Operating Results Revenues Derived from Clients and Private Equity Funds by Geographical Areas (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Segment Reporting Information [Line Items]        
Net revenue $ 385,592 $ 309,373 $ 994,076 $ 820,147
United States [Member]        
Segment Reporting Information [Line Items]        
Net revenue 322,128 238,231 714,983 603,239
Europe And Other [Member]        
Segment Reporting Information [Line Items]        
Net revenue 54,690 61,838 247,371 189,976
Latin America [Member]        
Segment Reporting Information [Line Items]        
Net revenue $ 8,774 $ 9,304 $ 31,722 $ 26,932